diff options
Diffstat (limited to 'drivers/acpi/events/evxface.c')
| -rw-r--r-- | drivers/acpi/events/evxface.c | 23 |
1 files changed, 17 insertions, 6 deletions
diff --git a/drivers/acpi/events/evxface.c b/drivers/acpi/events/evxface.c index 6d866a01f5f..94a6efe020b 100644 --- a/drivers/acpi/events/evxface.c +++ b/drivers/acpi/events/evxface.c @@ -5,7 +5,7 @@ *****************************************************************************/ /* - * Copyright (C) 2000 - 2007, R. Byron Moore + * Copyright (C) 2000 - 2008, Intel Corp. * All rights reserved. * * Redistribution and use in source and binary forms, with or without @@ -758,6 +758,12 @@ ACPI_EXPORT_SYMBOL(acpi_remove_gpe_handler) * * DESCRIPTION: Acquire the ACPI Global Lock * + * Note: Allows callers with the same thread ID to acquire the global lock + * multiple times. In other words, externally, the behavior of the global lock + * is identical to an AML mutex. On the first acquire, a new handle is + * returned. On any subsequent calls to acquire by the same thread, the same + * handle is returned. + * ******************************************************************************/ acpi_status acpi_acquire_global_lock(u16 timeout, u32 * handle) { @@ -770,14 +776,19 @@ acpi_status acpi_acquire_global_lock(u16 timeout, u32 * handle) /* Must lock interpreter to prevent race conditions */ acpi_ex_enter_interpreter(); - status = acpi_ev_acquire_global_lock(timeout); - acpi_ex_exit_interpreter(); + + status = acpi_ex_acquire_mutex_object(timeout, + acpi_gbl_global_lock_mutex, + acpi_os_get_thread_id()); if (ACPI_SUCCESS(status)) { - acpi_gbl_global_lock_handle++; + + /* Return the global lock handle (updated in acpi_ev_acquire_global_lock) */ + *handle = acpi_gbl_global_lock_handle; } + acpi_ex_exit_interpreter(); return (status); } @@ -798,11 +809,11 @@ acpi_status acpi_release_global_lock(u32 handle) { acpi_status status; - if (handle != acpi_gbl_global_lock_handle) { + if (!handle || (handle != acpi_gbl_global_lock_handle)) { return (AE_NOT_ACQUIRED); } - status = acpi_ev_release_global_lock(); + status = acpi_ex_release_mutex_object(acpi_gbl_global_lock_mutex); return (status); } |